Package org.jboss.netty.channel
Class AdaptiveReceiveBufferSizePredictor
- java.lang.Object
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- org.jboss.netty.channel.AdaptiveReceiveBufferSizePredictor
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- All Implemented Interfaces:
ReceiveBufferSizePredictor
public class AdaptiveReceiveBufferSizePredictor extends Object implements ReceiveBufferSizePredictor
TheReceiveBufferSizePredictor
that automatically increases and decreases the predicted buffer size on feed back.It gradually increases the expected number of readable bytes if the previous read fully filled the allocated buffer. It gradually decreases the expected number of readable bytes if the read operation was not able to fill a certain amount of the allocated buffer two times consecutively. Otherwise, it keeps returning the same prediction.
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Constructor Summary
Constructors Constructor Description AdaptiveReceiveBufferSizePredictor()
Creates a new predictor with the default parameters.AdaptiveReceiveBufferSizePredictor(int minimum, int initial, int maximum)
Creates a new predictor with the specified parameters.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
nextReceiveBufferSize()
Predicts the capacity of theChannelBuffer
for the next read operation depending on the actual number of read bytes in the previous read operation.void
previousReceiveBufferSize(int previousReceiveBufferSize)
Updates this predictor by specifying the actual number of read bytes in the previous read operation.
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Constructor Detail
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AdaptiveReceiveBufferSizePredictor
public AdaptiveReceiveBufferSizePredictor()
Creates a new predictor with the default parameters. With the default parameters, the expected buffer size starts from1024
, does not go down below64
, and does not go up above65536
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AdaptiveReceiveBufferSizePredictor
public AdaptiveReceiveBufferSizePredictor(int minimum, int initial, int maximum)
Creates a new predictor with the specified parameters.- Parameters:
minimum
- the inclusive lower bound of the expected buffer sizeinitial
- the initial buffer size when no feed back was receivedmaximum
- the inclusive upper bound of the expected buffer size
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Method Detail
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nextReceiveBufferSize
public int nextReceiveBufferSize()
Description copied from interface:ReceiveBufferSizePredictor
Predicts the capacity of theChannelBuffer
for the next read operation depending on the actual number of read bytes in the previous read operation.- Specified by:
nextReceiveBufferSize
in interfaceReceiveBufferSizePredictor
- Returns:
- the expected number of readable bytes this time
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previousReceiveBufferSize
public void previousReceiveBufferSize(int previousReceiveBufferSize)
Description copied from interface:ReceiveBufferSizePredictor
Updates this predictor by specifying the actual number of read bytes in the previous read operation.- Specified by:
previousReceiveBufferSize
in interfaceReceiveBufferSizePredictor
- Parameters:
previousReceiveBufferSize
- the actual number of read bytes in the previous read operation
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